Component

Human phosphate transporter PiT-1 / SLC20A1

Human phosphate transporter PiT-1 / SLC20A1. Species, exposure and limitations are retained in each linked claim.

4 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What acts on it

  1. XPR1 was identified as a binding partner of the phosphate-uptake transporter PiT1.

    XPR1 (human phosphate exporter) → Human phosphate transporter PiT-1 / SLC20A1 source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"}
    experimental_model
    Protein interaction, localization and phosphate-challenge cell experiments
    exposure
    Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge
    limitations
    Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human cultured HCT116, U2OS and Saos-2 systems
    plain_language
    The phosphate exit system can physically connect to the entry system.
    primary_references
    [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    tissue_or_cell_type
    Cellular phosphate uptake/export and LAMP1-positive puncta

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 724–735

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Protein interaction, localization and phosphate-challenge cell experiments · source_derived_draft · unverified_draft

    ### phosphorus-xpr1-pit1 XPR1 was identified as a binding partner of the phosphate-uptake transporter PiT1. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: The phosphate exit system can physically connect to the entry system. organism: Human cultured HCT116, U2OS and Saos-2 systems tissue_or_cell_type: Cellular phosphate uptake/export and LAMP1-positive puncta experimental_model: Protein interaction, localization and phosphate-challenge cell experiments limitations: Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement. exposure: Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge evidence_span: {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"} [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. PiT2 overexpression restored phosphate uptake and phosphate-induced calcification in human PiT1-deficient vascular smooth-muscle cells.

    PiT-2 / SLC20A2 → Human vascular smooth-muscle-cell matrix mineralization source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/23968976.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6704ac0400a286d5137384f4339dd6dffb0061a41a121b6c72a0b23353cbc6f9", "start_char": 0, "end_char": 1852, "text_sha256": "6704ac0400a286d5137384f4339dd6dffb0061a41a121b6c72a0b23353cbc6f9"}
    experimental_model
    Smooth-muscle-specific knockout and transporter compensation experiments
    exposure
    Mouse CKD plus dietary phosphate loading; PiT2 knockdown or expression rescue
    limitations
    Loss of one transporter can be masked by another. This refines a single-transporter model without proving every calcification pathway requires transport.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human
    plain_language
    The human-cell rescue supported a backup role for PiT2.
    primary_references
    [phosphorus-p23968976] Sodium-dependent phosphate cotransporters and phosphate-induced calcification of vascular smooth muscle cells: redundant roles for PiT-1 and PiT-2. (2013). https://pubmed.ncbi.nlm.nih.gov/23968976/ DOI: 10.1161/atvbaha.113.302249
    tissue_or_cell_type
    Vascular smooth muscle
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 854–865

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Smooth-muscle-specific knockout and transporter compensation experiments · source_derived_draft · unverified_draft

    ### phosphorus-human-pit2-rescue PiT2 overexpression restored phosphate uptake and phosphate-induced calcification in human PiT1-deficient vascular smooth-muscle cells. Condition category: machinery_impairment nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: The human-cell rescue supported a backup role for PiT2. organism: Human tissue_or_cell_type: Vascular smooth muscle experimental_model: Smooth-muscle-specific knockout and transporter compensation experiments limitations: Loss of one transporter can be masked by another. This refines a single-transporter model without proving every calcification pathway requires transport. exposure: Mouse CKD plus dietary phosphate loading; PiT2 knockdown or expression rescue evidence_span: {"source_cache": "artifacts/phosphorus-research/23968976.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6704ac0400a286d5137384f4339dd6dffb0061a41a121b6c72a0b23353cbc6f9", "start_char": 0, "end_char": 1852, "text_sha256": "6704ac0400a286d5137384f4339dd6dffb0061a41a121b6c72a0b23353cbc6f9"} [phosphorus-p23968976] Sodium-dependent phosphate cotransporters and phosphate-induced calcification of vascular smooth muscle cells: redundant roles for PiT-1 and PiT-2. (2013). https://pubmed.ncbi.nlm.nih.gov/23968976/ DOI: 10.1161/atvbaha.113.302249
    Complete structured claim and evidence

  2. The study reported later XPR1-dependent modulation of PiT1 turnover, resetting phosphate uptake after the earlier efflux response.

    XPR1 (human phosphate exporter) → Human PiT1 protein turnover source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"}
    experimental_model
    Protein interaction, localization and phosphate-challenge cell experiments
    exposure
    Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge
    limitations
    Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human cultured HCT116, U2OS and Saos-2 systems
    plain_language
    Changing transporter turnover adjusted how much phosphate entered later.
    primary_references
    [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    tissue_or_cell_type
    Cellular phosphate uptake/export and LAMP1-positive puncta

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 763–774

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Protein interaction, localization and phosphate-challenge cell experiments · source_derived_draft · unverified_draft

    ### phosphorus-ip8-uptake The study reported later XPR1-dependent modulation of PiT1 turnover, resetting phosphate uptake after the earlier efflux response. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: Changing transporter turnover adjusted how much phosphate entered later. organism: Human cultured HCT116, U2OS and Saos-2 systems tissue_or_cell_type: Cellular phosphate uptake/export and LAMP1-positive puncta experimental_model: Protein interaction, localization and phosphate-challenge cell experiments limitations: Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement. exposure: Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge evidence_span: {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"} [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    Complete structured claim and evidence

  3. Elevated extracellular phosphate induced concentration-dependent mineral deposition in human aortic smooth-muscle cultures; 1.4 mmol/L control cultures did not mineralize.

    Inorganic phosphate (Pi; protonation depends on pH) → Human vascular smooth-muscle-cell matrix mineralization source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/11009570.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b677e361792cc961c217b0437e58c9d5f54b3c0953b539a61c2b2bb732e51291", "start_char": 0, "end_char": 1607, "text_sha256": "b677e361792cc961c217b0437e58c9d5f54b3c0953b539a61c2b2bb732e51291"}
    experimental_model
    Concentration-response calcification in cultured aortic smooth muscle
    exposure
    Media phosphate 1.4 mmol/L versus elevated concentrations; phosphonoformic-acid inhibition
    limitations
    Culture mineralization is not a clinical intake threshold; the inhibitor does not establish one universally necessary transporter isoform.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human
    plain_language
    High phosphate promoted mineral deposition in this cell model.
    primary_references
    [phosphorus-p11009570] Phosphate regulation of vascular smooth muscle cell calcification. (2000). https://pubmed.ncbi.nlm.nih.gov/11009570/ DOI: 10.1161/01.res.87.7.e10
    tissue_or_cell_type
    Aortic smooth-muscle-cell matrix

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 776–787

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Concentration-response calcification in cultured aortic smooth muscle · source_derived_draft · unverified_draft

    ### phosphorus-vascular-mineralization Elevated extracellular phosphate induced concentration-dependent mineral deposition in human aortic smooth-muscle cultures; 1.4 mmol/L control cultures did not mineralize. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: High phosphate promoted mineral deposition in this cell model. organism: Human tissue_or_cell_type: Aortic smooth-muscle-cell matrix experimental_model: Concentration-response calcification in cultured aortic smooth muscle limitations: Culture mineralization is not a clinical intake threshold; the inhibitor does not establish one universally necessary transporter isoform. exposure: Media phosphate 1.4 mmol/L versus elevated concentrations; phosphonoformic-acid inhibition evidence_span: {"source_cache": "artifacts/phosphorus-research/11009570.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b677e361792cc961c217b0437e58c9d5f54b3c0953b539a61c2b2bb732e51291", "start_char": 0, "end_char": 1607, "text_sha256": "b677e361792cc961c217b0437e58c9d5f54b3c0953b539a61c2b2bb732e51291"} [phosphorus-p11009570] Phosphate regulation of vascular smooth muscle cell calcification. (2000). https://pubmed.ncbi.nlm.nih.gov/11009570/ DOI: 10.1161/01.res.87.7.e10
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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